Mercurial > cgi-bin > hgweb.cgi > tincan
annotate tincan.py @ 30:f34d5a90d618 draft header-includes
Fix minor bug in error handling.
| author | David Barts <n5jrn@me.com> |
|---|---|
| date | Mon, 27 May 2019 14:58:40 -0700 |
| parents | 2e3ac3d7b0a4 |
| children | 443a0001d841 |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python3 |
| 2 # -*- coding: utf-8 -*- | |
| 3 # As with Bottle, it's all in one big, ugly file. For now. | |
| 4 | |
| 5 # I m p o r t s | |
| 6 | |
| 7 import os, sys | |
| 8 import ast | |
| 9 import binascii | |
| 10 from base64 import b16encode, b16decode | |
|
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11 import functools |
| 2 | 12 import importlib |
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13 from inspect import isclass |
| 0 | 14 import io |
| 2 | 15 import py_compile |
| 16 from stat import S_ISDIR, S_ISREG | |
| 5 | 17 from string import whitespace |
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18 import traceback |
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19 import urllib |
| 0 | 20 |
| 21 import bottle | |
| 22 | |
| 2 | 23 # E x c e p t i o n s |
| 0 | 24 |
| 25 class TinCanException(Exception): | |
| 26 """ | |
| 27 The parent class of all exceptions we raise. | |
| 28 """ | |
| 29 pass | |
| 30 | |
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31 class TemplateHeaderError(TinCanException): |
| 0 | 32 """ |
| 33 Raised upon encountering a syntax error in the template headers. | |
| 34 """ | |
| 35 def __init__(self, message, line): | |
| 36 super().__init__(message, line) | |
| 37 self.message = message | |
| 38 self.line = line | |
| 39 | |
| 40 def __str__(self): | |
|
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41 return "line {0}: {1}".format(self.line, self.message) |
| 0 | 42 |
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43 class IncludeError(TinCanException): |
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44 """ |
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45 Raised when we run into problems #include'ing something, usually |
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46 because it doesn't exist. |
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47 """ |
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48 def __init__(self, message, source): |
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49 super().__init__(message, source) |
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50 self.message = message |
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51 self.source = source |
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52 |
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53 def __str__(self): |
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54 return "{0}: #include error: {1}".format(self.source, self.message) |
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55 |
| 0 | 56 class ForwardException(TinCanException): |
| 57 """ | |
| 58 Raised to effect the flow control needed to do a forward (server-side | |
| 59 redirect). It is ugly to do this, but other Python frameworks do and | |
| 60 there seems to be no good alternative. | |
| 61 """ | |
| 62 def __init__(self, target): | |
| 63 self.target = target | |
| 64 | |
| 65 class TinCanError(TinCanException): | |
| 66 """ | |
| 67 General-purpose exception thrown by TinCan when things go wrong, often | |
| 68 when attempting to launch webapps. | |
| 69 """ | |
| 70 pass | |
| 71 | |
| 2 | 72 # T e m p l a t e s |
| 73 # | |
| 0 | 74 # Template (.pspx) files. These are standard templates for a supported |
| 75 # template engine, but with an optional set of header lines that begin | |
| 76 # with '#'. | |
| 77 | |
| 78 class TemplateFile(object): | |
| 79 """ | |
| 80 Parse a template file into a header part and the body part. The header | |
| 81 is always a leading set of lines, each starting with '#', that is of the | |
| 82 same format regardless of the template body. The template body varies | |
| 83 depending on the selected templating engine. The body part has | |
| 84 each header line replaced by a blank line. This preserves the overall | |
| 85 line numbering when processing the body. The added newlines are normally | |
| 86 stripped out before the rendered page is sent back to the client. | |
| 87 """ | |
| 5 | 88 _END = "#end" |
| 89 _LEND = len(_END) | |
| 90 _WS = set(whitespace) | |
| 91 | |
| 0 | 92 def __init__(self, raw, encoding='utf-8'): |
| 93 if isinstance(raw, io.TextIOBase): | |
| 94 self._do_init(raw) | |
| 95 elif isinstance(raw, str): | |
| 96 with open(raw, "r", encoding=encoding) as fp: | |
| 97 self._do_init(fp) | |
| 98 else: | |
| 99 raise TypeError("Expecting a string or Text I/O object.") | |
| 100 | |
| 101 def _do_init(self, fp): | |
| 102 self._hbuf = [] | |
| 103 self._bbuf = [] | |
| 104 self._state = self._header | |
| 105 while True: | |
| 106 line = fp.readline() | |
| 107 if line == '': | |
| 108 break | |
| 109 self._state(line) | |
| 110 self.header = ''.join(self._hbuf) | |
| 111 self.body = ''.join(self._bbuf) | |
| 112 | |
| 113 def _header(self, line): | |
| 114 if not line.startswith('#'): | |
| 115 self._state = self._body | |
| 116 self._state(line) | |
| 117 return | |
| 5 | 118 if line.startswith(self._END) and (len(line) == self._LEND or line[self._LEND] in self._WS): |
| 119 self._state = self._body | |
| 0 | 120 self._hbuf.append(line) |
| 121 | |
| 122 def _body(self, line): | |
| 123 self._bbuf.append(line) | |
| 124 | |
| 125 class TemplateHeader(object): | |
| 126 """ | |
| 127 Parses and represents a set of header lines. | |
| 128 """ | |
| 2 | 129 _NAMES = [ "errors", "forward", "methods", "python", "template" ] |
| 0 | 130 _FNAMES = [ "hidden" ] |
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131 _ANAMES = [ "include" ] |
| 0 | 132 |
| 133 def __init__(self, string): | |
| 134 # Initialize our state | |
| 135 for i in self._NAMES: | |
| 136 setattr(self, i, None) | |
| 137 for i in self._FNAMES: | |
| 138 setattr(self, i, False) | |
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139 for i in self._ANAMES: |
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140 setattr(self, i, []) |
| 0 | 141 # Parse the string |
| 142 count = 0 | |
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143 nameset = set(self._NAMES + self._FNAMES + self._ANAMES) |
| 0 | 144 seen = set() |
| 145 lines = string.split("\n") | |
| 146 if lines and lines[-1] == "": | |
| 147 del lines[-1] | |
| 148 for line in lines: | |
| 149 # Get line | |
| 150 count += 1 | |
| 151 if not line.startswith("#"): | |
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152 raise TemplateHeaderError("Does not start with '#'.", count) |
| 0 | 153 try: |
| 154 rna, rpa = line.split(maxsplit=1) | |
| 155 except ValueError: | |
| 5 | 156 rna = line.rstrip() |
| 157 rpa = None | |
| 0 | 158 # Get name, ignoring remarks. |
| 159 name = rna[1:] | |
| 160 if name == "rem": | |
| 161 continue | |
| 5 | 162 if name == "end": |
| 163 break | |
| 0 | 164 if name not in nameset: |
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165 raise TemplateHeaderError("Invalid directive: {0!r}".format(rna), count) |
| 0 | 166 if name in seen: |
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167 raise TemplateHeaderError("Duplicate {0!r} directive.".format(rna), count) |
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168 if name not in self._ANAMES: |
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169 seen.add(name) |
| 0 | 170 # Flags |
| 5 | 171 if name in self._FNAMES: |
| 0 | 172 setattr(self, name, True) |
| 173 continue | |
| 174 # Get parameter | |
| 5 | 175 if rpa is None: |
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176 raise TemplateHeaderError("Missing parameter.", count) |
| 0 | 177 param = rpa.strip() |
| 178 for i in [ "'", '"']: | |
| 179 if param.startswith(i) and param.endswith(i): | |
| 180 param = ast.literal_eval(param) | |
| 181 break | |
| 182 # Update this object | |
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183 if name in self._ANAMES: |
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184 getattr(self, name).append(param) |
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185 else: |
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186 setattr(self, name, param) |
| 0 | 187 |
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188 # C h a m e l e o n |
| 2 | 189 # |
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190 # Support for Chameleon templates (the kind TinCan uses by default). |
| 0 | 191 |
| 192 class ChameleonTemplate(bottle.BaseTemplate): | |
| 193 def prepare(self, **options): | |
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194 from chameleon import PageTemplate, PageTemplateFile |
| 0 | 195 if self.source: |
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196 self.tpl = PageTemplate(self.source, encoding=self.encoding, |
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197 **options) |
| 0 | 198 else: |
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199 self.tpl = PageTemplateFile(self.filename, encoding=self.encoding, |
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200 search_path=self.lookup, **options) |
| 0 | 201 |
| 202 def render(self, *args, **kwargs): | |
| 203 for dictarg in args: | |
| 204 kwargs.update(dictarg) | |
| 205 _defaults = self.defaults.copy() | |
| 206 _defaults.update(kwargs) | |
| 207 return self.tpl.render(**_defaults) | |
| 208 | |
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209 chameleon_template = functools.partial(bottle.template, template_adapter=ChameleonTemplate) |
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210 chameleon_view = functools.partial(bottle.view, template_adapter=ChameleonTemplate) |
| 0 | 211 |
| 2 | 212 # U t i l i t i e s |
| 0 | 213 |
| 214 def _normpath(base, unsplit): | |
| 215 """ | |
| 216 Split, normalize and ensure a possibly relative path is absolute. First | |
| 217 argument is a list of directory names, defining a base. Second | |
| 218 argument is a string, which may either be relative to that base, or | |
| 219 absolute. Only '/' is supported as a separator. | |
| 220 """ | |
| 221 scratch = unsplit.strip('/').split('/') | |
| 222 if not unsplit.startswith('/'): | |
| 223 scratch = base + scratch | |
| 224 ret = [] | |
| 225 for i in scratch: | |
| 226 if i == '.': | |
| 227 continue | |
| 228 if i == '..': | |
| 229 ret.pop() # may raise IndexError | |
| 230 continue | |
| 231 ret.append(i) | |
| 232 return ret | |
| 233 | |
| 234 def _mangle(string): | |
| 235 """ | |
| 236 Turn a possibly troublesome identifier into a mangled one. | |
| 237 """ | |
| 238 first = True | |
| 239 ret = [] | |
| 240 for ch in string: | |
| 241 if ch == '_' or not (ch if first else "x" + ch).isidentifier(): | |
| 242 ret.append('_') | |
| 243 ret.append(b16encode(ch.encode("utf-8")).decode("us-ascii")) | |
| 244 else: | |
| 245 ret.append(ch) | |
| 246 first = False | |
| 247 return ''.join(ret) | |
| 248 | |
| 249 # The TinCan class. Simply a Bottle webapp that contains a forward method, so | |
| 250 # the code-behind can call request.app.forward(). | |
| 251 | |
| 252 class TinCan(bottle.Bottle): | |
| 253 def forward(self, target): | |
| 254 """ | |
| 255 Forward this request to the specified target route. | |
| 256 """ | |
| 257 source = bottle.request.environ['PATH_INFO'] | |
| 258 base = source.strip('/').split('/')[:-1] | |
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259 if bottle.request.environ.get(_FTYPE, False): |
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260 raise TinCanError("{0}: forward from error page".format(source)) |
| 0 | 261 try: |
| 262 exc = ForwardException('/' + '/'.join(_normpath(base, target))) | |
| 263 except IndexError as e: | |
| 264 raise TinCanError("{0}: invalid forward to {1!r}".format(source, target)) from e | |
| 265 raise exc | |
| 266 | |
| 2 | 267 # C o d e B e h i n d |
| 268 # | |
| 0 | 269 # Represents the code-behind of one of our pages. This gets subclassed, of |
| 270 # course. | |
| 271 | |
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272 class BasePage(object): |
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273 """ |
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274 The parent class of both error and normal pages' code-behind. |
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275 """ |
| 0 | 276 def handle(self): |
| 277 """ | |
| 278 This is the entry point for the code-behind logic. It is intended | |
| 279 to be overridden. | |
| 280 """ | |
| 281 pass | |
| 282 | |
| 283 def export(self): | |
| 284 """ | |
| 285 Export template variables. The default behavior is to export all | |
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286 non-hidden non-callables that don't start with an underscore. |
| 0 | 287 This method can be overridden if a different behavior is |
| 288 desired. It should always return a dict or dict-like object. | |
| 289 """ | |
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290 ret = { 'page': self } |
| 0 | 291 for name in dir(self): |
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292 if name in self._HIDDEN or name.startswith('_'): |
| 0 | 293 continue |
| 294 value = getattr(self, name) | |
| 295 if callable(value): | |
| 296 continue | |
| 297 ret[name] = value | |
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298 return ret |
| 0 | 299 |
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300 class Page(BasePage): |
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301 """ |
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302 The code-behind for a normal page. |
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303 """ |
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304 # Non-private things we refuse to export anyhow. |
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305 _HIDDEN = set([ "request", "response" ]) |
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306 |
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307 def __init__(self, req, resp): |
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308 """ |
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309 Constructor. This is a lightweight operation. |
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310 """ |
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311 self.request = req # app context is request.app in Bottle |
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312 self.response = resp |
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313 |
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314 class ErrorPage(BasePage): |
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315 """ |
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316 The code-behind for an error page. |
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317 """ |
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318 _HIDDEN = set() |
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319 |
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320 def __init__(self, req, err): |
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321 """ |
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322 Constructor. This is a lightweight operation. |
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323 """ |
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324 self.request = req |
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325 self.error = err |
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326 |
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327 # I n c l u s i o n |
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328 # |
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329 # Most processing is in the TinCanRoute class; this just interprets and |
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330 # represents arguments to the #include header directive. |
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331 |
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332 class _IncludedFile(object): |
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333 def __init__(self, raw): |
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334 if raw.startswith('<') and raw.endswith('>'): |
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335 raw = raw[1:-1] |
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336 self.in_lib = True |
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337 else: |
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338 self.in_lib = False |
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339 comma = raw.find(',') |
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340 if comma < 0: |
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341 raise ValueError("missing comma") |
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342 self.vname = raw[:comma] |
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343 if self.vname == "": |
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344 raise ValueError("empty variable name") |
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345 self.fname = raw[comma+1:] |
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346 if self.fname == "": |
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347 raise ValueError("empty file name") |
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348 if not self.fname.endswith(_IEXTEN): |
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349 raise ValueError("file does not end in {0}".format(_IEXTEN)) |
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350 |
| 2 | 351 # R o u t e s |
| 352 # | |
| 0 | 353 # Represents a route in TinCan. Our launcher creates these on-the-fly based |
| 354 # on the files it finds. | |
| 355 | |
| 2 | 356 _ERRMIN = 400 |
| 357 _ERRMAX = 599 | |
|
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358 _IEXTEN = ".pt" |
| 2 | 359 _PEXTEN = ".py" |
| 360 _TEXTEN = ".pspx" | |
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361 _FLOOP = "tincan.forwards" |
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362 _FORIG = "tincan.origin" |
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363 _FTYPE = "tincan.iserror" |
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364 |
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365 class _TinCanErrorRoute(object): |
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366 """ |
|
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367 A route to an error page. These don't get routes created for them, |
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368 and are only reached if an error routes them there. Unless you create |
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369 custom code-behind, only two variables are available to your template: |
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370 request (bottle.Request) and error (bottle.HTTPError). |
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371 """ |
|
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372 def __init__(self, template, includes, klass): |
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373 self._template = template |
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374 self._template.prepare() |
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375 self._includes = includes |
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376 self._class = klass |
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377 |
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378 def __call__(self, e): |
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379 bottle.request.environ[_FTYPE] = True |
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380 try: |
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381 obj = self._class(bottle.request, e) |
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382 obj.handle() |
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383 tvars = self._includes.copy() |
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384 tvars.update(obj.export()) |
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385 return self._template.render(tvars) |
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386 except bottle.HTTPResponse as e: |
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387 return e |
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388 except Exception as e: |
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389 traceback.print_exc() |
|
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390 # Bottle doesn't allow error handlers to themselves cause |
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391 # errors, most likely as a measure to prevent looping. So |
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392 # this will cause a "Critical error while processing request" |
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393 # page to be displayed, and any installed error pages to be |
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394 # ignored. |
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395 raise bottle.HTTPError(status=500, exception=e) |
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396 |
|
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397 class _TinCanRoute(object): |
| 0 | 398 """ |
| 399 A route created by the TinCan launcher. | |
| 400 """ | |
| 401 def __init__(self, launcher, name, subdir): | |
| 402 self._fsroot = launcher.fsroot | |
| 403 self._urlroot = launcher.urlroot | |
| 404 self._name = name | |
| 2 | 405 self._python = name + _PEXTEN |
| 406 self._fspath = os.path.join(launcher.fsroot, *subdir, name + _TEXTEN) | |
| 407 self._urlpath = self._urljoin(launcher.urlroot, *subdir, name + _TEXTEN) | |
| 0 | 408 self._origin = self._urlpath |
| 409 self._subdir = subdir | |
| 410 self._seen = set() | |
|
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411 self._tclass = launcher.tclass |
| 0 | 412 self._app = launcher.app |
|
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413 self._save_includes = launcher.debug |
| 0 | 414 |
| 2 | 415 def launch(self): |
| 0 | 416 """ |
| 417 Launch a single page. | |
| 418 """ | |
| 419 # Build master and header objects, process #forward directives | |
|
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420 oheader = None |
| 0 | 421 while True: |
|
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422 try: |
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423 self._template = TemplateFile(self._fspath) |
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424 except IOError as e: |
|
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425 if oheader is not None: |
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426 note = "{0}: invalid #forward: ".format(self._origin) |
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427 else: |
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428 note = "" |
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429 raise TinCanError("{0}{1!s}".format(note, e)) from e |
|
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430 try: |
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431 self._header = TemplateHeader(self._template.header) |
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432 except TemplateHeaderError as e: |
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433 raise TinCanError("{0}: {1!s}".format(self._fspath, e)) from e |
|
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434 if oheader is None: |
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435 oheader = self._header # save original header |
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436 elif (oheader.errors is None) != (self._header.errors is None): |
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437 raise TinCanError("{0}: invalid #forward".format(self._origin)) |
| 0 | 438 if self._header.forward is None: |
| 439 break | |
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440 # print("forwarding from:", self._urlpath) # debug |
| 0 | 441 self._redirect() |
|
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442 # print("forwarded to:", self._urlpath) # debug |
|
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443 # If this is a #hidden page, we ignore it for now, since hidden pages |
| 0 | 444 # don't get routes made for them. |
|
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445 if oheader.hidden and not oheader.errors: |
| 0 | 446 return |
|
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447 # Get the code-behind #python |
|
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448 if self._header.python is None: |
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449 self._python_specified = False |
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450 else: |
| 2 | 451 if not self._header.python.endswith(_PEXTEN): |
|
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452 raise TinCanError("{0}: #python files must end in {1}".format(self._urlpath, _PEXTEN)) |
| 0 | 453 self._python = self._header.python |
|
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454 self._python_specified = True |
| 0 | 455 # Obtain a class object by importing and introspecting a module. |
| 3 | 456 self._getclass() |
|
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457 # Build body object (#template) and obtain #includes. |
| 3 | 458 if self._header.template is not None: |
| 459 if not self._header.template.endswith(_TEXTEN): | |
|
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460 raise TinCanError("{0}: #template files must end in {1}".format(self._urlpath, _TEXTEN)) |
| 16 | 461 try: |
|
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462 rtpath = self._splitpath(self._header.template) |
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463 tpath = os.path.normpath(os.path.join(self._fsroot, *rtpath)) |
| 16 | 464 tfile = TemplateFile(tpath) |
|
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465 except OSError as e: |
| 16 | 466 raise TinCanError("{0}: invalid #template: {1!s}".format(self._urlpath, e)) from e |
| 467 except IndexError as e: | |
| 468 raise TinCanError("{0}: invalid #template".format(self._urlpath)) from e | |
|
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469 self._body = self._tclass(source=tfile.body) |
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470 try: |
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471 includes = TemplateHeader(tfile.header).include |
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472 except TemplateHeaderError as e: |
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473 raise TinCanError("{0}: {1!s}".format(self._fspath, e)) from e |
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474 ibase = rtpath[:-1] |
| 3 | 475 else: |
|
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476 self._body = self._tclass(source=self._template.body) |
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477 includes = self._header.include |
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478 ibase = self._subdir |
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479 self._body.prepare() |
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480 # Process includes |
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481 self._includes = {} |
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482 for include in includes: |
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483 try: |
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484 include = _IncludedFile(include) |
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485 except ValueError as e: |
| 30 | 486 raise TinCanError("{0}: bad #include: {1!s}".format(self._urlpath, e)) from e |
|
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487 if include.in_lib: |
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488 fdir = os.path.join(self._fsroot, _WINF, "tlib") |
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489 else: |
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490 fdir = os.path.join(self._fsroot, *ibase) |
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491 try: |
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492 tmpl = self._tclass(name=include.fname, lookup=[fdir]) |
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493 tmpl.prepare() |
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494 # tmpl.render() # is this needed? |
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495 except Exception as e: |
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496 raise TinCanError("{0}: bad #include: {1!s}".format(self._urlpath, e)) from e |
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497 self._includes[include.vname] = tmpl.tpl |
|
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498 # If this is an #errors page, register it as such. |
|
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499 if oheader.errors is not None: |
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500 self._mkerror(oheader.errors) |
|
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501 return # this implies #hidden |
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502 # Get #methods for this route |
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503 if self._header.methods is None: |
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504 methods = [ 'GET' ] |
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505 else: |
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506 methods = [ i.upper() for i in self._header.methods.split() ] |
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507 if not methods: |
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508 raise TinCanError("{0}: no #methods specified".format(self._urlpath)) |
| 3 | 509 # Register this thing with Bottle |
| 6 | 510 print("adding route:", self._origin, '('+','.join(methods)+')') # debug |
| 3 | 511 self._app.route(self._origin, methods, self) |
| 512 | |
| 513 def _splitpath(self, unsplit): | |
| 514 return _normpath(self._subdir, unsplit) | |
| 515 | |
|
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516 def _mkerror(self, rerrors): |
| 3 | 517 try: |
|
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518 errors = [ int(i) for i in rerrors.split() ] |
| 3 | 519 except ValueError as e: |
| 520 raise TinCanError("{0}: bad #errors line".format(self._urlpath)) from e | |
| 521 if not errors: | |
| 522 errors = range(_ERRMIN, _ERRMAX+1) | |
|
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523 route = _TinCanErrorRoute(self._tclass(source=self._template.body), |
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524 self._includes, self._class) |
| 3 | 525 for error in errors: |
| 526 if error < _ERRMIN or error > _ERRMAX: | |
| 527 raise TinCanError("{0}: bad #errors code".format(self._urlpath)) | |
| 5 | 528 self._app.error_handler[error] = route # XXX |
| 3 | 529 |
|
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530 def _gettime(self, path): |
|
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531 try: |
|
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532 return os.stat(path).st_mtime |
|
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533 except FileNotFoundError: |
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534 return 0 |
| 8 | 535 except OSError as e: |
|
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536 raise TinCanError(str(e)) from e |
|
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537 |
| 3 | 538 def _getclass(self): |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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539 try: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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540 pypath = os.path.normpath(os.path.join(self._fsroot, *self._splitpath(self._python))) |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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|
541 except IndexError as e: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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542 raise TinCanError("{0}: invalid #python".format(self._urlpath)) from e |
|
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543 klass = ErrorPage if self._header.errors else Page |
|
7
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544 # Give 'em a default code-behind if they don't furnish one |
|
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545 pytime = self._gettime(pypath) |
|
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|
546 if not pytime: |
|
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Fix bugs in #python directive, make code-behind class loading simpler.
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547 if self._python_specified: |
|
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|
548 raise TinCanError("{0}: #python file not found".format(self._urlpath)) |
|
9
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|
549 self._class = klass |
|
7
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Eliminate a stat() call, allow no code-behind on pages.
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|
550 return |
|
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551 # Else load the code-behind from a .py file |
| 0 | 552 pycpath = pypath + 'c' |
|
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Eliminate a stat() call, allow no code-behind on pages.
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|
553 pyctime = self._gettime(pycpath) |
| 0 | 554 try: |
|
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Eliminate a stat() call, allow no code-behind on pages.
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|
555 if pyctime < pytime: |
|
4
0d47859f792a
Finally got "hello, world" working. Still likely many bugs.
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diff
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|
556 py_compile.compile(pypath, cfile=pycpath, doraise=True) |
|
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|
557 except py_compile.PyCompileError as e: |
|
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|
558 raise TinCanError(str(e)) from e |
|
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Finally got "hello, world" working. Still likely many bugs.
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|
559 except Exception as e: |
|
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Finally got "hello, world" working. Still likely many bugs.
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diff
changeset
|
560 raise TinCanError("{0}: {1!s}".format(pypath, e)) from e |
|
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Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
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diff
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|
561 try: |
|
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Finally got "hello, world" working. Still likely many bugs.
David Barts <n5jrn@me.com>
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|
562 spec = importlib.util.spec_from_file_location(_mangle(self._name), pycpath) |
| 0 | 563 mod = importlib.util.module_from_spec(spec) |
| 564 spec.loader.exec_module(mod) | |
| 565 except Exception as e: | |
| 16 | 566 raise TinCanError("{0}: error importing: {1!s}".format(pycpath, e)) from e |
|
19
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|
567 # Locate a suitable class. We look for the "deepest" class object |
|
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|
568 # we can find in the inheritance tree. |
| 0 | 569 self._class = None |
|
19
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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570 score = -1 |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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|
571 ambig = False |
| 0 | 572 for i in dir(mod): |
| 573 v = getattr(mod, i) | |
|
19
5d9a1b82251a
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574 if not isclass(v): |
|
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|
575 continue |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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576 d = self._cldepth(klass, v) |
|
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|
577 if d > score: |
|
15
560c8fb55e4a
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578 self._class = v |
|
19
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|
579 score = d |
|
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580 ambig = False |
|
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|
581 elif d == score: |
|
5d9a1b82251a
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|
582 ambig = True |
| 3 | 583 if self._class is None: |
|
9
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|
584 raise TinCanError("{0}: contains no {1} classes".format(pypath, klass.__name__)) |
|
19
5d9a1b82251a
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diff
changeset
|
585 if ambig: |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
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|
586 raise TinCanError("{0}: contains ambiguous {1} classes".format(pypath, klass.__name__)) |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
587 |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
588 # This might fail for complex inheritance schemes from the classes of |
|
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589 # interest (so don't use them!). |
|
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Return the "deepest" subclass; this allows subclassing tincan.Page and
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18
diff
changeset
|
590 def _cldepth(self, base, klass, count=0): |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
David Barts <n5jrn@me.com>
parents:
18
diff
changeset
|
591 if klass is object: |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
592 # not found |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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diff
changeset
|
593 return -1 |
|
5d9a1b82251a
Return the "deepest" subclass; this allows subclassing tincan.Page and
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parents:
18
diff
changeset
|
594 elif klass is base: |
|
5d9a1b82251a
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595 # just found |
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596 return count |
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597 else: |
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598 # must recurse |
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599 for c in klass.__bases__: |
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600 result = self._cldepth(base, c, count=count+1) |
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601 if result > 0: |
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602 return result |
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603 return -1 |
| 0 | 604 |
| 605 def _redirect(self): | |
| 606 try: | |
| 607 rlist = self._splitpath(self._header.forward) | |
|
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608 forw = '/' + '/'.join(rlist) |
|
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609 if forw in self._seen: |
|
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610 raise TinCanError("{0}: #forward loop".format(self._origin)) |
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611 self._seen.add(forw) |
| 0 | 612 rname = rlist.pop() |
| 613 except IndexError as e: | |
| 614 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) from e | |
|
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615 name, ext = os.path.splitext(rname) |
| 2 | 616 if ext != _TEXTEN: |
| 0 | 617 raise TinCanError("{0}: invalid #forward".format(self._urlpath)) |
| 618 self._subdir = rlist | |
| 2 | 619 self._python = name + _PEXTEN |
| 0 | 620 self._fspath = os.path.join(self._fsroot, *self._subdir, rname) |
|
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621 self._urlpath = '/' + self._urljoin(*self._subdir, rname) |
| 0 | 622 |
| 623 def _urljoin(self, *args): | |
| 624 args = list(args) | |
| 625 if args[0] == '/': | |
| 626 args[0] = '' | |
| 627 return '/'.join(args) | |
| 628 | |
|
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629 def __call__(self): |
| 0 | 630 """ |
| 631 This gets called by the framework AFTER the page is launched. | |
| 632 """ | |
|
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633 target = None |
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634 try: |
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635 obj = self._class(bottle.request, bottle.response) |
|
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636 obj.handle() |
|
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637 tvars = self._includes.copy() |
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638 tvars.update(obj.export()) |
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639 return self._body.render(tvars) |
|
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640 except ForwardException as fwd: |
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641 target = fwd.target |
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642 except bottle.HTTPResponse as e: |
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643 return e |
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644 except Exception as e: |
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645 traceback.print_exc() |
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646 raise bottle.HTTPError(status=500, exception=e) |
|
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647 if target is None: |
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648 message = "{0}: unexpected null target".format(self._urlpath) |
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649 sys.stderr.write(message + '\n') |
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650 raise bottle.HTTPError(status=500, exception=TinCanError(message)) |
|
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651 # We get here if we are doing a server-side programmatic |
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652 # forward. |
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653 environ = bottle.request.environ |
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654 if _FORIG not in environ: |
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655 environ[_FORIG] = self._urlpath |
| 2 | 656 if _FLOOP not in environ: |
| 657 environ[_FLOOP] = set([self._urlpath]) | |
|
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658 elif target in environ[_FLOOP]: |
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659 message = "{0}: forward loop detected".format(environ[_FORIG]) |
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660 sys.stderr.write(message + '\n') |
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661 raise bottle.HTTPError(status=500, exception=TinCanError(message)) |
|
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662 environ[_FLOOP].add(target) |
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663 environ['bottle.raw_path'] = target |
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664 environ['PATH_INFO'] = urllib.parse.quote(target) |
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665 route, args = self._app.router.match(environ) |
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666 environ['route.handle'] = environ['bottle.route'] = route |
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667 environ['route.url_args'] = args |
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668 return route.call(**args) |
| 0 | 669 |
| 2 | 670 # L a u n c h e r |
| 671 | |
| 672 _WINF = "WEB-INF" | |
| 673 _BANNED = set([_WINF]) | |
| 674 | |
| 675 class _Launcher(object): | |
| 676 """ | |
| 677 Helper class for launching webapps. | |
| 678 """ | |
|
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679 def __init__(self, fsroot, urlroot, tclass, logger): |
| 2 | 680 """ |
| 681 Lightweight constructor. The real action happens in .launch() below. | |
| 682 """ | |
| 683 self.fsroot = fsroot | |
| 684 self.urlroot = urlroot | |
|
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685 self.tclass = tclass |
|
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686 self.logger = logger |
| 2 | 687 self.app = None |
|
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688 self.errors = 0 |
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689 self.debug = False |
| 2 | 690 |
| 691 def launch(self): | |
| 692 """ | |
| 693 Does the actual work of launching something. XXX - modifies sys.path | |
| 694 and never un-modifies it. | |
| 695 """ | |
| 696 # Sanity checks | |
| 697 if not self.urlroot.startswith("/"): | |
|
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698 self.errors = 1 |
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699 self.logger("urlroot not absolute: {0!r}".format(self.urlroot)) |
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700 return self |
| 2 | 701 if not os.path.isdir(self.fsroot): |
|
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702 self.errors = 1 |
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703 self.logger("no such directory: {0!r}".format(self.fsroot)) |
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704 return self |
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705 # Make any needed directories. Refuse to launch things that don't |
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706 # contain WEB-INF, to prevent accidental launches of undesired |
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707 # directory trees containing sensitive files. |
| 2 | 708 winf = os.path.join(self.fsroot, _WINF) |
|
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709 if not os.path.isdir(winf): |
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710 self.errors = 1 |
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711 self.logger("no WEB-INF directory in {0!r}".format(self.fsroot)) |
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712 return self |
| 2 | 713 lib = os.path.join(winf, "lib") |
|
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714 for i in [ lib ]: |
| 2 | 715 if not os.path.isdir(i): |
| 716 os.mkdir(i) | |
| 717 # Add our private lib directory to sys.path | |
| 718 sys.path.insert(1, os.path.abspath(lib)) | |
| 719 # Do what we gotta do | |
| 720 self.app = TinCan() | |
| 721 self._launch([]) | |
|
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722 return self |
| 2 | 723 |
| 724 def _launch(self, subdir): | |
| 725 for entry in os.listdir(os.path.join(self.fsroot, *subdir)): | |
| 726 if not subdir and entry in _BANNED: | |
| 727 continue | |
| 728 etype = os.stat(os.path.join(self.fsroot, *subdir, entry)).st_mode | |
| 729 if S_ISREG(etype): | |
| 730 ename, eext = os.path.splitext(entry) | |
| 731 if eext != _TEXTEN: | |
| 732 continue # only look at interesting files | |
|
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733 route = _TinCanRoute(self, ename, subdir) |
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734 try: |
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735 route.launch() |
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736 except TinCanError as e: |
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737 self.logger(str(e)) |
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738 if self.debug: |
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739 while e.__cause__ != None: |
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740 e = e.__cause__ |
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741 self.logger("\t{0}: {1!s}".format(e.__class__.__name__, e)) |
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742 self.errors += 1 |
| 2 | 743 elif S_ISDIR(etype): |
| 744 self._launch(subdir + [entry]) | |
| 745 | |
|
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746 def _logger(message): |
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747 sys.stderr.write(message) |
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748 sys.stderr.write('\n') |
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749 |
|
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|
750 def launch(fsroot=None, urlroot='/', tclass=ChameleonTemplate, logger=_logger, debug=False): |
| 2 | 751 """ |
| 752 Launch and return a TinCan webapp. Does not run the app; it is the | |
| 753 caller's responsibility to call app.run() | |
| 754 """ | |
| 755 if fsroot is None: | |
| 756 fsroot = os.getcwd() | |
|
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757 launcher = _Launcher(fsroot, urlroot, tclass, logger) |
|
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758 launcher.debug = debug |
|
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|
759 launcher.launch() |
|
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760 return launcher.app, launcher.errors |
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761 |
|
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762 # XXX - We cannot implement a command-line launcher here; see the |
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763 # launcher script for why. |